Why is compost soil so dark?
Black compost is formed by the breaking down of organic materials. The end result of this breakdown is humic and fulvic acids that contain carbon. Carbon is a dark black material and thus why the compost looks dark black.
Citations:http://forums2.gardenweb.com/forums/load/soil/msg0511192613263.html?14
http://idiotsguides.com/static/quickguides/homegarden/compost_your_guide_to_maki...
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